Base station system

ABSTRACT

A base station system includes a base station device ( 1 ), a wireless transmission device ( 2 ) and a data transfer device ( 3 ), each of which can be installed outdoors. Enclosures ( 12, 22  and  32 ) of the devices ( 1 - 3 ) each provide a degree of protection from water and dust ingress necessary for being installed outdoors. The enclosure ( 12 ) of the base station device ( 1 ) accommodates electronic equipment ( 11 ) functioning as a base station. The enclosure ( 22 ) of the wireless transmission device ( 2 ) accommodates electronic equipment ( 21 ) functioning as a radio station to perform wireless transmission with the other device for connecting the base station device ( 1 ) to a mobile backhaul network. The enclosure ( 32 ) of the data transfer device ( 3 ) accommodates electronic equipment ( 31 ) functioning as a router or a switch to transfer data packets or data flames between the base station device ( 1 ) and the wireless transmission device ( 2 ). This eliminates the need for construction of a building/shelter to install the base station system.

TECHNICAL FIELD

The present invention relates to a base station system that includes abase station device, and a wireless transmission device and a datatransfer device for connecting the base station device to a mobilebackhaul network.

BACKGROUND ART

A wireless transmission system using microwaves or millimeter waves isgenerally used to connect a base station to a mobile backhaul network.Wireless connection between a base station and a mobile backhaul networkhas advantages over wired connection using optical fibers in easynetwork construction, high economic efficiency, and low constraints onthe installation location of the base station.

A mobile backhaul network is an upper-level network to which a basestation is connected. The mobile backhaul network includes, for example,a control node that performs signaling with a base station and a mobilestation, a switching node that processes voice calls, and a transfernode that performs data transfer. Typically, the mobile backhaul networkis managed by a mobile telecommunications carrier (a mobile operator).The mobile backhaul network includes a core network and, in somearchitecture, further includes a radio access network node. For example,in the case of UTRAN (UMTS Terrestrial Radio Access Network), the mobilebackhaul network includes an RNC (Radio Network Controller) and a corenetwork (e.g., a SGSN (Serving GPRS Support Node), a GGSN (Gateway GPRSSupport Node), and an MSC (Mobile Switching Center)). Further, in thecase of E-UTRAN (Evolved UTRAN), the mobile backhaul network includes acore network (e.g., an MME (Mobility Management Entity), an S-GW(Serving Gateway), and a P-GW (PDN Gateway)).

For example, Patent Literature 1 is known which describes a wirelesstransmission device for connecting a base station to a mobile backhaulnetwork. Patent Literature 1 discloses a microwave wireless transmissiondevice that includes an antenna and a front-end device (ODU: OutdoorUnit) installed outdoors and a back-end device (IDU: Indoor Unit)installed indoors. The front-end device (ODU) primarily performs analogsignal processing such as frequency up/down conversion andamplification. The back-end device primarily performs digital signalprocessing such as channel coding/decoding, interleaving/deinterleaving,and modulation/demodulation.

CITATION LIST Patent Literature

-   Patent Literature 1: International Patent Publication No. WO    2011/162281

SUMMARY OF INVENTION Technical Problem

As described in Patent Literature 1, in the known wireless transmissiondevice for connecting a base station to a mobile backhaul network, apart (i.e., the front-end) of the device is installed outdoors. However,the back-end device of the wireless transmission device is installedindoors (e.g., inside a building or a shelter). Further, the basestation device is also installed indoors. Furthermore, a data transferdevice (e.g., a router, a layer-3 switch or a layer-2 switch) is used totransfer data (e.g., IP (Internet Protocol) packets or MAC (Media AccessControl) frames) between the base station and the wireless transmissiondevice in some cases, and the data transfer device is also installedindoors.

The inventors of the present invention have made studies in order tomore easily install a base station system that includes a base stationdevice, and a wireless transmission device and a data transfer devicefor connecting the base station device to a mobile backhaul network. Abase station system wirelessly connected to a mobile backhaul networkdoes not require laying optical fibers but requires construction of abuilding/shelter for accommodating equipment needed to be installedindoors. Accordingly, base station facilities that do not requireconstruction of a building/shelter are expected to be widely used inareas and countries under many geographical constraints. Further, basestation facilities that do not require construction of abuilding/shelter are expected to contribute to quick restoration of amobile phone infrastructure in the event of an emergency such as anearthquake or a flood.

The present invention has been accomplished based on the above-describedfindings by the inventors, and an object of the present invention isthus to provide a base station system (including a base station device,a wireless transmission device and a data transfer device) that does notrequire construction of a building/shelter.

Solution to Problem

According to an aspect of the present invention, a base station systemincludes a base station device, a wireless transmission device and adata transfer device, each of which is capable of being installedoutdoors. The base station device includes first electronic equipmentthat functions as a base station to relay data between a plurality ofmobile stations and a mobile backhaul network, and a first enclosurethat accommodates the first electronic equipment. The wirelesstransmission device includes second electronic equipment that functionsas a radio station to perform wireless transmission with another devicefor connecting the base station device to the mobile backhaul network,and a second enclosure that accommodates the second electronicequipment. The data transfer device includes third electronic equipmentthat functions as a router or a switch to transfer data packets or dataflames between the base station device and the wireless transmissiondevice, and a third enclosure that accommodates the third electronicequipment. Each of the first to third enclosures provides a degree ofprotection from water and dust ingress necessary for being installedoutdoors.

Advantageous Effects of Invention

According to the aspect of the present invention described above, it ispossible to provide a base station system (including a base stationdevice, a wireless transmission device and a data transfer device) thatdoes not require construction of a building/shelter.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an external perspective view showing an external structureexample and an installation example of a base station system accordingto a first embodiment;

FIG. 2 is a block diagram showing an internal structure example andconnections of the base station system according to the firstembodiment; and

FIG. 3 is a block diagram showing an internal structure example andconnections of a base station system according to a second embodiment.

DESCRIPTION OF EMBODIMENTS

Specific embodiments of the present invention will be describedhereinafter in detail with reference to the drawings. It is noted thatin the description of the drawings, the same elements will be denoted bythe same reference symbols and redundant description will be omitted toclarify the explanation.

First Embodiment

FIG. 1 is an external perspective view showing an external structureexample and an installation example of a base station system accordingto this embodiment. FIG. 2 is a block diagram showing an internalstructure example and connections of the base station system accordingto this embodiment.

The base station system includes a base station device 1, a wirelesstransmission device 2 and a data transfer device 3, each of which can beinstalled outdoors. The base station device 1 is, for example, a UTRANbase station (i.e., NodeB) or an E-UTRAN base station (eNB). Thewireless transmission device 2 is, for example, a microwave ormillimeter wave wireless transmission device. For example, the wirelesstransmission device 2 uses a carrier wave at a frequency of at least 20GHz and achieves a transmission distance of at least 500 meters.Preferably, the wireless transmission device 2 uses the 25 GHz frequencyband or 60 GHz frequency band and achieves a transmission speed of 19Mbit/s bidirectionally and a transmission distance of about 1 kilometersto about 10 kilometers. The data transfer device 3 performs transfer ofdata packets or data flames (e.g., IP packets or MAC frames). The datatransfer device 3 is, for example, a router, a layer-3 switch or alayer-2 switch. The base station device 1, the wireless transmissiondevice 2 and the data transfer device 3 are configured so that they canbe installed outdoors. Hereinafter, the structure of each of the basestation device 1, the wireless transmission device 2 and the datatransfer device 3 is described with reference to FIGS. 1 and 2.

The base station device 1 includes electronic equipment 11 and anenclosure 12 that accommodates the electronic equipment 11. Theelectronic equipment 11 functions as a base station that relays databetween a plurality of mobile stations and a mobile backhaul network.The enclosure 12 accommodates the electronic equipment 11 and provides adegree of protection from water and dust ingress necessary for beinginstalled outdoors.

The wireless transmission device 2 includes electronic equipment 21 andan enclosure 22 that accommodates the electronic equipment 21. Theelectronic equipment 21 functions as a radio station that performswireless transmission with other device for connecting the base stationdevice 1 to the mobile backhaul network. The other device may be awireless transmission device that has a regenerative relay function or anon-regenerative relay function. The electronic equipment 21 has aback-end function and a front-end function. The back-end functiontypically includes digital signal processing at baseband. The front-endfunction typically includes analog signal processing at carrierfrequencies (RF (Radio frequency) band). To be more specific, theback-end function includes channel coding and modulation/demodulation,and the front-end function includes frequency conversion and signalamplification. The enclosure 22 accommodates the electronic equipment 21and provides a degree of protection from water and dust ingressnecessary for being installed outdoors.

The data transfer device 3 includes electronic equipment 31 and anenclosure 32 that accommodates the electronic equipment 31. Theelectronic equipment 31 functions as a router or a switch that transfersdata packets or data flames between the base station device 1 and thewireless transmission device 2. The enclosure 32 accommodates theelectronic equipment 31 and provides a degree of protection from waterand dust ingress necessary for being installed outdoors.

The degree of protection from water and dust ingress of each enclosures12, 22 and 32 described above may be IP65 according to IEC 60529 definedby IEC (International Electrotechnical Commission), for example.

As described above, in this embodiment, the base station device 1, thewireless transmission device 2 and the data transfer device 3 arerespectively accommodated in individual enclosures 12, 22 and 32, andprovides a degree of protection from water and dust ingress necessaryfor being installed outdoors. Therefore, none of those three devicesrequires installation inside a building/shelter. Thus, there is no needto construct a building/shelter when installing the base station systemaccording to this embodiment. The base station system according to thisembodiment that does not require construction of a building/shelter canbe expected to be widely used in areas and countries where there aremany geographical constraints on construction of a building/shelter.Further, the base station system according to this embodiment can beexpected to contribute to quick restoration of a mobile phoneinfrastructure in the event of an emergency such as an earthquake or aflood.

Further, the fact that there is no need to construct a building/shelteris effective also when the owners or administrators of the three devices1 to 3 are different from one another. In the case where the owners oradministrators of the three devices 1 to 3 are different, it is assumedthat acquisition of use rights of the site to construct abuilding/shelter and sharing of the cost to construct a building/sheltercan cause a problem. In this embodiment, such a problem rarely arisesbecause a building/shelter is not needed.

Further, in this embodiment, the wireless transmission device 2 has astructure in which the electronic equipment 21 that serves as a radiostation that performs wireless transmission with the other device isintegrally housed in the enclosure 22. In other words, the wirelesstransmission device 2 has a structure in which the electronic equipment21 having the front-end function and the back-end function areintegrally housed in the enclosure 22. This eliminates the need forwiring operations to connect a front-end device and a back-end devicewhen installing the base station system.

Hereinafter, another specific structure shown in the example of FIGS. 1and 2 is described. Note that, the specific structure described below ismerely one example of this embodiment and can be modified asappropriate.

In the structure example shown in FIGS. 1 and 2, the base station device1, the wireless transmission device 2 and the data transfer device 3 areconfigured so that wiring operations necessary to start operation iscompleted by carrying out wiring to connection terminals (e.g.,communication cable connection terminals and power supply cableconnection terminals) exposed outside the enclosures 12, 22 and 32,without carrying out additional wiring to the electronic equipment 11,21 and 31 respectively accommodated inside the enclosures 12, 22 and 32,in the installation locations of those three devices. In other words,the base station device 1, the wireless transmission device 2 and thedata transfer device 3 are configured so that wiring operations iscompleted only by external wiring to the enclosures 12, 22 and 32. Thereis thus no need to open the enclosures 12, 22 and 32 while carrying outwiring operations in the installation work of the base station device 1,the wireless transmission device 2 and the data transfer device 3. It isthereby possible to reduce the load of wiring operations necessary forinstalling the base station system. Further, there is a possibility thatoperations that involve opening the enclosures 12, 22 and 32 causedegradation of dustproof and waterproof capabilities due to the loss ofairtightness of the enclosures. On the other hand, those issues can beavoided in this embodiment.

As shown in FIGS. 1 and 2, the enclosure 12 of the base station device 1may be provided with a connection terminal 13 for a communication cable41 that connects between the electronic equipment 11 and the datatransfer device 3 to allow communication. The enclosure 22 of thewireless transmission device 2 may be provided with a connectionterminal 23 for a communication cable 42. The communication cable 42connects between the electronic equipment 21 and the data transferdevice 3 to allow communication and supplies the operating power of theelectronic equipment 21 from the data transfer device 3. The enclosure32 of the data transfer device 3 may be provided with connectionterminals 33 and 34 for the communication cable 41 and 42 respectively.Thus, in the example of FIGS. 1 and 2, the communication cable 42 isused in common for communication of the wireless transmission device 2and power supply to the wireless transmission device 2. The power supplymay be done by PoE (Power over Ethernet), for example. It is therebypossible to reduce the number of cables necessary for the installationof the wireless transmission device 2. Particularly, because microwavesand millimeter waves have a high rectilinear propagation property, thewireless transmission device 2 that uses them as carrier waves needs tobe used in the state where there are few obstacles and a sufficientline-of-sight is afforded between the wireless transmission device 2 andthe other device. Therefore, the wireless transmission device 2 needs tobe installed in the higher position than the other two devices (the basestation device 1 and the data transfer device 3). Accordingly, arelatively long cable is required for power supply and communication ofthe wireless transmission device 2, and therefore the effect of usingthe communication cable 42 for both communication and power supply asdescribed in this embodiment is significant.

As shown in FIGS. 1 and 2, the enclosure 12 of the base station device 1may be provided with an antenna connection terminal 15 for connectionwith an antenna 17. The antenna 17 is an antenna for a base station thatis mounted outside the enclosure 12.

As shown in FIG. 1, the base station device 1, the wireless transmissiondevice 2 and the data transfer device 3 may be configured so that theycan be mounted on a wall surface or a pole surface with use of mountingmembers 61 to 63. In the example of FIG. 1, the three devices 1 to 3 aremounted on a cylindrical pole surface 71. Since all of those threedevices 1 to 3 can be mounted on a wall surface or a pole surface,flexibility in the installation of the base station system is enhanced.Note that, although the example of FIG. 1 shows the layout where thethree devices 1 to 3 are mounted on one pole surface 71 in closeproximity to one another, this layout is merely one example. Forexample, only the wireless transmission device 2 may be mounted on thepole surface 71 and the base station device 1 and the data transferdevice 3 may be mounted on other places (e.g., on the outer wall surfaceof a building).

As shown in FIG. 1, the enclosures 12, 22 and 32 may be portable. Thisfacilitates a change in the installation location of the base stationdevice 1, the wireless transmission device 2 and the data transferdevice 3.

As shown in FIGS. 1 and 2, the wireless transmission device 2 may be inan integrated and compact structure where not only the electronicequipment 21 but also an antenna 20 is accommodated in the enclosure 22.This allows connections between the antenna 20 and the electronicequipment 21 to be made before shipment of the wireless transmissiondevice 2. It is thereby possible to reduce the load of wiring operationsnecessary for installing the wireless transmission device 2. Further,operations for mounting an antenna on a wireless device (e.g., afront-end device (ODU)) and adjusting a direction of the antenna at aheight such as a steel tower take time and are at high risk. With thewireless transmission device 2 having an integrated and compactstructure where the antenna 20 is also accommodated in the enclosure 22,it is expected to reduce the workload necessary for antenna directionadjustment.

As shown in FIG. 1, it is preferred that the shapes of the communicationcable connection terminals 13, 23, 33 and 34 of the three devices 1 to 3are all the same. It can be a burden on a worker if different kinds ofconnection terminals coexist in one work place. With the same shape ofthe connection terminals 13, 23, 33 and 34, it is expected to improvethe efficiency of wiring operations.

As shown in FIGS. 1 and 2, the enclosure 32 of the data transfer device3 may be provided with a connection terminal 35 to which a power supplycable 53 for receiving power from an AC or DC external power supply isconnected. Further, as shown in FIG. 2, the data transfer device 3 mayinclude power supply equipment 36 that is accommodated in the enclosure32. The power supply equipment 36 receives power from the external powersupply, supplies operating power to the electronic equipment 31, andalso supplies DC voltage to the communication cable 42. In the exampleof FIG. 2, the data transfer device 3 (the power supply equipment 36)receives DC voltage (e.g., −48V) that is supplied from an external AC/DCconverter 50. The AC/DC converter 50 converts AC voltage (e.g., AC200V)to DC voltage (e.g., −48V) and outputs it. Further, as shown in FIG. 2,the wireless transmission device 2 may include power supply equipment 24that is accommodated in the enclosure 22, receives DC voltage (e.g.,−48V) via the communication cable 42 and supplies operating power to theelectronic equipment 21.

As shown in FIGS. 1 and 2, the enclosure 12 of the base station device 1may be provided with a connection terminal 14 to which a power supplycable 51 for receiving power from an AC or DC external power supply isconnected. Further, as shown in FIG. 2, the base station device 1 mayinclude power supply equipment 16 that is accommodated in the enclosure12, receives power from the external power supply and supplies operatingpower to the electronic equipment 11. In the example of FIG. 2, the basestation device 1 (the power supply equipment 16) receives DC voltage(e.g., −48V) supplied from the external AC/DC converter 50.

In the structure examples of FIGS. 1 and 2, the base station device 1has the integrated and compact structure where the electronic equipment11 and the power supply equipment 16 are accommodated in the enclosure12 that can be installed outdoors. Further, the wireless transmissiondevice 2 has the integrated and compact structure where the antenna 20,the electronic equipment 21 and the power supply equipment 24 areaccommodated in the enclosure 22 that can be installed outdoors.Furthermore, the data transfer device 3 has the integrated and compactstructure where the electronic equipment 31 and the power supplyequipment 36 are accommodated in the enclosure 32 that can be installedoutdoors. The devices 1 to 3 do not require internal wiring operationsinvolving opening the enclosures during the installation work. That is,in the structure example of FIGS. 1 and 2, each of the devices 1 to 3can be installed outdoors, is integrally housed in each enclosure, hascompact structure, and is configured so that the installation work ofthe base station system can be completed by cable connections betweenthose devices. Thus, the base station system shown in the structureexample of FIGS. 1 and 2 provides the mobile backhaul network that ishighly resistant to environmental conditions and easily installablebecause the devices 1 to 3 have functions in cooperation with oneanother to make a connection with the mobile backhaul network.

Second Embodiment

The first embodiment describes the specific example in which the basestation device 1 receives power from an external power supply throughthe power supply cable connection terminal 14 that is different from thecommunication cable connection terminal 13. However, the base stationdevice 1 may operate with power that is supplied from the data transferdevice 3 using the communication cable 41, just like the wirelesstransmission device 2. The power supply may be done by PoE (Power overEthernet), for example. To be more specific, as shown in FIG. 3, thepower supply equipment 36 of the data transfer device 3 supplies DCvoltage (e.g., −48V) to the communication cable 42. Then, the powersupply equipment 16 of the base station device 1 receives the DC voltage(e.g., −48V) via the communication cable 41 and supplies operating powerto the electronic equipment 11. This structure eliminates the need forwiring operations of a power supply cable to the base station device 1,thereby reducing the load of wiring operations and facilitating theinstallation of the base station system including the devices 1 to 3.

Other Embodiments

The first and second embodiments describe the example in which each ofthe communication cables 41 and 42 (e.g., STP (Shielded Twisted Pair)cables) is used in common for communication and power supply. However, apower supply cable may be used in common for communication and powersupply. Specifically, a power supply cable that connects the datatransfer device 3 with the wireless transmission device 2 for powersupply to the wireless transmission device 2 may be used also forcommunication between the data transfer device 3 and the wirelesstransmission device 2.

The first and second embodiments describe the example in which one basestation device 1 and one wireless transmission device 2 are used.However, in the case where, for example, there is high traffic demand inthe installation location of the base station system, a plurality ofbase station devices 1 may be installed. In this case, one wirelesstransmission device 2 may be used for connecting the plurality of basestation devices 1 to the mobile backhaul network. Note that multiplexingof the traffic related to the plurality of base station devices 1 may beperformed by packet (frame) multiplexing in the data transfer device 3or may be performed using the multiplexing function of the wirelesstransmission device 2. Further, in the case where, for example, theconnection with the mobile backhaul network is made redundant or thebase station system further relays the traffic of a base stationinstalled in another location, a plurality of wireless transmissiondevices 2 may be installed.

Although the base station device 1 and the data transfer device 3 areconnected only through one communication cable 42 in the example ofFIGS. 1 and 2, those devices may be connected through a plurality ofcommunication cables. Likewise, the wireless transmission device 2 andthe data transfer device 3 may be connected through a plurality ofcommunication cables.

Further, the invention is not limited to the embodiments describedabove, and it will be obvious that various modifications may be madetherein without departing from the spirit and scope of the presentinvention described above.

This application is based upon and claims the benefit of priority fromJapanese patent application No. 2012-027177, filed on Feb. 10, 2012, thedisclosure of which is incorporated herein in its entirety by reference.

REFERENCE SIGNS LIST

-   1 BASE STATION DEVICE-   2 WIRELESS TRANSMISSION DEVICE-   3 DATA TRANSFER DEVICE-   11 ELECTRONIC EQUIPMENT OF BASE STATION-   12 ENCLOSURE-   13 COMMUNICATION CABLE CONNECTION TERMINAL-   14 POWER SUPPLY CABLE CONNECTION TERMINAL-   15 ANTENNA CONNECTION TERMINAL-   16 POWER SUPPLY EQUIPMENT-   17 ANTENNA-   20 ANTENNA-   21 ELECTRONIC EQUIPMENT OF WIRELESS TRANSMISSION DEVICE-   22 ENCLOSURE-   23 COMMUNICATION CABLE TERMINAL-   24 POWER SUPPLY EQUIPMENT-   31 ELECTRONIC EQUIPMENT OF DATA TRANSFER DEVICE-   32 ENCLOSURE-   33 COMMUNICATION CABLE CONNECTION TERMINAL-   34 COMMUNICATION CABLE CONNECTION TERMINAL-   35 POWER SUPPLY CABLE CONNECTION TERMINAL-   36 POWER SUPPLY EQUIPMENT-   41 COMMUNICATION CABLE-   42 COMMUNICATION CABLE-   50 AC/DC CONVERTER-   51 POWER SUPPLY CABLE-   53 POWER SUPPLY CABLE-   61 MOUNTING MEMBER-   62 MOUNTING MEMBER-   63 MOUNTING MEMBER-   71 POLE

1. A base station system comprising: a base station device, a wirelesstransmission device and a data transfer device, each capable of beinginstalled outdoors, the base station device including: first electronicequipment that functions as a base station to relay data between aplurality of mobile stations and a mobile backhaul network; and a firstenclosure that accommodates the first electronic equipment and providesa degree of protection from water and dust ingress necessary for beinginstalled outdoors, the wireless transmission device including: secondelectronic equipment that functions as a radio station to performwireless transmission with another device for connecting the basestation device to the mobile backhaul network; and a second enclosurethat accommodates the second electronic equipment and provides a degreeof protection from water and dust ingress necessary for being installedoutdoors, and the data transfer device including: third electronicequipment that functions as a router or a switch to transfer datapackets or data flames between the base station device and the wirelesstransmission device; and a third enclosure that accommodates the thirdelectronic equipment and provides a degree of protection from water anddust ingress necessary for being installed outdoors.
 2. The base stationsystem according to claim 1, wherein the base station device, thewireless transmission device and the data transfer device are configuredso that wiring operations necessary to start operation is completed bycarrying out wiring to connection terminals exposed outside the first tothird enclosures, without carrying out additional wiring to the first tothird electronic equipment respectively accommodated inside the first tothird enclosures, in installation locations of those three devices. 3.The base station system according to claim 1, wherein the base stationdevice, the wireless transmission device and the data transfer deviceare configured so that wiring operations necessary to start operation iscompleted by carrying out wiring to connection terminals exposed outsidethe first to third enclosures, without opening the first to thirdenclosures, in installation locations of those three devices.
 4. Thebase station system according to claim 1, wherein the first to thirdenclosures are configured to be mounted on a wall surface or a polesurface with use of mounting members.
 5. The base station systemaccording to claim 1, wherein each of the first to third enclosures isportable.
 6. The base station system according to claim 1, wherein thewireless transmission device further includes an antenna accommodated inthe second enclosure, connected to the second electronic equipment andused for wireless transmission.
 7. The base station system according toclaim 1, wherein each of the first to third enclosures provides a degreeof protection from water and dust ingress is corresponds to at leastIP65 according to IEC 60529 defined by IEC (InternationalElectrotechnical Commission).
 8. The base station system according toclaim 1, wherein the first enclosure is provided with a first connectionterminal for a first cable that connects between the first electronicequipment and the data transfer device to allow communication, thesecond enclosure is provided with a second connection terminal for asecond cable that connects between the second electronic equipment andthe data transfer device to allow communication and supplies operatingpower of the second electronic equipment from the data transfer device,and the third enclosure is provided with a third connection terminal forthe first cable and a fourth connection terminal for the second cable.9. The base station system according to claim 8, wherein the datatransfer device further includes power supply equipment that isaccommodated in the third enclosure, receives power from a DC or ACexternal power supply, supplies operating power to the third electronicequipment, and supplies DC voltage to the second cable, and the thirdenclosure is further provided with a connection terminal of a powersupply cable connected to the external power supply.
 10. The basestation system according to claim 8, wherein the data transfer devicesupplies operating power of the first electronic equipment to the basestation device through the first cable.
 11. The base station systemaccording to claim 8, wherein the first to fourth connection terminalshave the same shape.
 12. The base station system according to claim 1,wherein the first enclosure is further provided with a connectionterminal with an antenna used for wireless communication with theplurality of mobile stations.
 13. The base station system according toclaim 1, wherein the base station device is a UTRAN (UMTS TerrestrialRadio Access Network) or an E-UTRAN (Evolved UTRAN) base station. 14.The base station system according to claim 1, wherein the wirelesstransmission device uses a carrier wave at a frequency of at least 20GHz and achieves a transmission distance of at least 500 meters.